This is just a fantastic book, and I can’t say enough good things about it. It is most emphatically *not* Science Fiction, but it is - somewhat accidentally - an excellent reference for fans of the Alternate History genre. Presumably it’d be good for writers as well. It’s hard to pour through this thing and not toy with constructing some “Mighta’been” worlds. Be ye Fen or Dane, however, this is just a fascinating, smart, and endlessly neat little reference.
“Ah, but what’s it all about?”